Thread: US$4000 and they still didn't get it near right

It's a weird one alright. 2hp, 12" material handling impeller because the cyclone is after the fan, only 5 micron filter and a price tag to match a Felder RL125. I fail to see the appeal.

yeah....but......it looks waaaaaaaaay cooler than most small dustys I have seen in the past. And its heaps quieter than my DC7. But I guess my dusty would be quiet too if I reduce the flow to ~600cfm, by way of removing power to the DC7 and spinning the fan by hand


This is a better link btw, proper website page which includes a video.
Gyro Air - What's New - Tools - Bridge City Tool Works

Yeah, I saw this a couple of weeks ago and couldn't figure out the benefit - cost equation on this one. Apart from a nice looking build quality and very low noise level, the performance in terms of airflow just seems a little low for the money. Assuming they are being 100% honest with the numbers it isn't horrible, but still. It isn't clear what static pressure they are quoting that 765cfm at; maybe it's at a higher system static pressure which could make it fairly good.

To give you an idea of the static pressure that the extractor generates - their literature quotes 1400pa whereas something like the Festool extractors generate 24000pa.

Not really a high pressure or a high flow system, without high quality filtration, so its only claim to fame would be that it is quiet and not very tall.

Price ex China was originally quoted as US$2999.

99.7% dust separation efficiency BEFORE filtration - with the filter rated at 5 microns.

Originally Posted by Lappa

99.7% dust separation efficiency BEFORE filtration - with the filter rated at 5 microns.

That does sound good. The pity is, it's difficult to tell what that really means. If it's 99.7% by weight (I assume it is) then there are potentially still a hell of a lot of fine particles headed towards the filter, and then most of those, particularly the sub 5 micron stuff will be getting pumped straight back out. Not sure why they couldn't have put a really good MERV rated filter at the end, given that it shouldn't be clogging quickly with 99.7% pre-filter separation.

It may be good, it may be lousy - I just thought the specifications re filtration should be correctly stated

Originally Posted by richmond68

It's a weird one alright. .....

Yep, sure is weird. Sort of like:

• a trash can lid separator, then
• the impellor, then
• then the cyclonic separator, then
• 5 micron filters.

Everything that passes the "trash can lid separator" goes through the impellor which will chomp much of it into even finer, more dangerous dust.

Or am I missing something?



Fair Winds

Graeme

Since I can almost get 2 ClearVue 1800's for the same cost as the one Bridge City is selling my decision is easy. What I am curious about is if the horizontal cyclone in it can be scaled up to handle the same airflows as the ClearVue. It would tuck up nicely along a shop ceiling where floorspace is at a premium. From what is shown of it there isn't enough detail for a home made version. There are some horizontal ones made by Aerodyne and the simpler unit has enough info in the literature to make a close approximation. I tried to get pricing info for one but when I told them I was comparing to a ClearVue I never heard back. No surprise as they are focused on the commercial market.

Pete

Originally Posted by GraemeCook

Everything that passes the "trash can lid separator" goes through the impellor which will chomp much of it into even finer, more dangerous dust.

Or am I missing something.
Graeme

Fan first, which from the video animation appears to be a straight blade impeller so inefficient, then a 90° bend into a wye, then though the two stage separators before reaching the filter. Maybe there is some merit to the design (perhaps the efficiency of blowing through a cyclonic separator is better than suction with a small underpowered fan) but if it can't flow enough to capture fine dust at the source, the filtration efficiency is a moot point.

Originally Posted by QC Inspector

There are some horizontal ones made by Aerodyne and the simpler unit has enough info in the literature to make a close approximation. I tried to get pricing info for one but when I told them I was comparing to a ClearVue I never heard back. No surprise as they are focused on the commercial market.

Pete

Ive only seen a horizontal cyclone used in grain handling, and it had a secondary air intake for contra flow which is probably what Aerodyne do. I don't think they are designed with separating PM 2.5 particulates in mind. I don't remember exactly what blower size it had, but I think the motor was north of 50kW.

The Australian distributor for Harvey lists the unit as POA, I doubt if they expect to sell many of them.

They have 2 kinds of horizontal. One like you described with additional air injection and the other the, GPC, that comes in either a vertical or horizontal version. Basically with the GPC they replace the long cone of a cyclone with stubby one in the case of the vertical, or a short chamber exiting 90 degrees to the cyclone body. I had a sizing pdf from them but deleted it when they didn't give me any prices. The one for a thousand CFM was very close to the diameter of an oil drum and the length from the top of the spiral intake to the dished plate, the same length as an oil drum too. The part after the dished plate was about a third again longer. With some experimenting one could make their own. I recall seeing somewhere in the site or a Utube video of it that separations to 2 micron are claimed. At some point an affordable horizontal cyclone will come to market, although I don't think it will be in the near future.

Pete